As for VLPIs, there is a number of configuration bits that cannot
be directly communicated through the normal irqchip API, and we
have to use our good old friend set_vcpu_affinity.

This is used to configure group and priority for a given vSGI.

Signed-off-by: Marc Zyngier <m...@kernel.org>
---
 drivers/irqchip/irq-gic-v3-its.c   | 18 ++++++++++++++++++
 include/linux/irqchip/arm-gic-v4.h |  5 +++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index a9753435c4ff..a2e824eae43f 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3969,6 +3969,23 @@ static int its_sgi_get_irqchip_state(struct irq_data *d,
        return 0;
 }
 
+static int its_sgi_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
+{
+       struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
+       struct its_cmd_info *info = vcpu_info;
+
+       switch (info->cmd_type) {
+       case PROP_UPDATE_SGI:
+               vpe->sgi_config[d->hwirq].priority = info->priority;
+               vpe->sgi_config[d->hwirq].group = info->group;
+               its_configure_sgi(d, false);
+               return 0;
+
+       default:
+               return -EINVAL;
+       }
+}
+
 static struct irq_chip its_sgi_irq_chip = {
        .name                   = "GICv4.1-sgi",
        .irq_mask               = its_sgi_mask_irq,
@@ -3976,6 +3993,7 @@ static struct irq_chip its_sgi_irq_chip = {
        .irq_set_affinity       = its_sgi_set_affinity,
        .irq_set_irqchip_state  = its_sgi_set_irqchip_state,
        .irq_get_irqchip_state  = its_sgi_get_irqchip_state,
+       .irq_set_vcpu_affinity  = its_sgi_set_vcpu_affinity,
 };
 
 static int its_sgi_irq_domain_alloc(struct irq_domain *domain,
diff --git a/include/linux/irqchip/arm-gic-v4.h 
b/include/linux/irqchip/arm-gic-v4.h
index 30b4855bf766..a1a9d40266f5 100644
--- a/include/linux/irqchip/arm-gic-v4.h
+++ b/include/linux/irqchip/arm-gic-v4.h
@@ -98,6 +98,7 @@ enum its_vcpu_info_cmd_type {
        SCHEDULE_VPE,
        DESCHEDULE_VPE,
        INVALL_VPE,
+       PROP_UPDATE_SGI,
 };
 
 struct its_cmd_info {
@@ -110,6 +111,10 @@ struct its_cmd_info {
                        bool            g0en;
                        bool            g1en;
                };
+               struct {
+                       u8              priority;
+                       bool            group;
+               };
        };
 };
 
-- 
2.20.1

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